The antonyms for the word "most deep-toned" are "shallow," "high-pitched," and "light." Shallow refers to something that is of little depth or profoundness. High-pitched means a sound that is of a higher frequency or register than most deep-toned sounds. Light implies something that is not heavy, dense, or significant. These antonyms can be used to describe sounds, voices, or musical instruments, such as a shallow voice, a high-pitched whistle, or a light flute. Understanding antonyms helps to expand vocabulary and provides us with the right words to convey our thoughts and ideas effectively.